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1.
日粮中添加L—NAME对肉鸡腹水综合征发生的影响及其机理 总被引：6，自引：1，他引：5
应用低温环境和日粮中添加三碘甲腺原氨酸（3，3，5－triiodothyronine,T3)诱发肉鸡腹水综合征，同时通过日粮添加一氧化氮合酶抑制剂L－NAME，研究了抑制NO的合成对肉鸡肺动脉压及肉鸡腹水综合征发生的影响。180羽AA肉鸡随机等分为对照组（C）、试验组（A、B），参试鸡14日前按常规条件饲养。14日龄后C组鸡按常规条件饲养，A、B组鸡舍温按每日1－2℃逐步降至12℃，同时日粮中添加T3 1．5mg/kg以诱发腹水综合征。另外，B组肉鸡从14日龄起在日粮中添加100mg/kgL－NAME至试验结束。分别于3、4、5、6周龄测定各组肉鸡肺动脉平均压（mean pulmonary arterial pressure,mPAP)、红细胞压积、右心全心比、血浆一氧化氮（NO）和内皮素（endothelin-1,ET-1)水平并记录腹水综合征发病率。结果显示：低温添加T3处理后，A、B组肉鸡腹水综合征发病率增加，但B组高于A组；A、B组肉鸡mPAP从5周龄起高于C组（P＜0．05）；A、B组右心全心比的升高分别在6、5周龄时出现，B组右心全心比的升高比A组提前1周；B组 肉鸡血浆NO水平低于A组，差异不显著；A、B组肉鸡血浆ET－1水平高于C组（P＜0．05）；在6周龄时，A组肉鸡心率明显降低，B组肉鸡心率明显升高。随着肺动脉高压和右心肥大的出现，心率的升高可能促进了右心衰竭和肉鸡腹水综合征的发生。上述结果提示，抑制NO的合成可能促进了肉鸡肺动脉高压，右心肥大的形成和肉鸡腹水综合征的发生。 相似文献
2.
一氧化氮供体硝普钠降低肉鸡肺动脉压试验研究 总被引：1，自引：0，他引：1
AA肉鸡100羽，随机等分为对照组、试验组、试验组肉鸡自8日龄起给予含0．2％的钠离子的饮水以诱发肉鸡肺动脉高压综合征，按常规方法饲养。并通过右心导管法观察血管内注入硝普纳（Sodium Nitroprusside,SNP)前后两组肉鸡肺动脉平均压（Mean pulmonary arterial pressure,mPAP)变化，与此同时，还观察一氧化氮（Nitric Oxide,NO)与肉鸡肺动脉压间的关系。结果发现试验组肉鸡mPAP高于对照组（P＜0．01），注入SNP后试验组和对照组肉鸡血浆NO水平都显著升高（P＜0．01），而mPAP都显著降低（P＜0．01），试验组肉鸡mPAP降压幅度大于对照组（P＜0．05）。表明SNP可通过释放NO降低肉鸡mPAP。 相似文献
3.
碳酸氢钠可减少肉鸡腹水症的发生率 总被引：1，自引：1，他引：0
肉鸡腹水症（体液储留在鸡腹腔内）是一种容易造成鸡群死亡的禽病，通常发育快的鸡种和饲喂高水平饲料的鸡容易发生该病，在气压低的高原地区饲养肉鸡也容易得这种病。 美国一所大学的专家通过试验证明，在肉鸡饲料中添加碳酸氢钠（俗称“小苏打”，添加量为１％左右），可以明显降低肉鸡腹水症的发生率。 试验在相当于海拨３ ０００ ｍ的低压室内进行。将肉鸡分为对照组和试验组，其中对照组喂以玉米豆粕型饲料，试验组喂以玉米豆粕型饲料添加１％的碳酸氢钠。结果，试验组肉鸡的腹水症发生率只有对照组肉鸡发病率的一半，这说明饲料中添加… 相似文献
4.
为寻求预防肉鸡腹水综合症的中草药方药，试验采用麻黄、桂枝、黄芩、黄柏等10味中草药组成麻黄桂枝五苓汤，进行防治试验。结果表明，常温育雏肉鸡腹水综合疽发病率为1．56％，而低温育雏发病率高达17．19％，差异极显著（P〈0．01）。在低温条件下，肉鸡腹水综合症发病率预防组为4．69％，模型组为17．19％，差异极显著（P〈0．01）。这说明麻黄桂枝五苓汤能有效地预防内鸡腹水综合症的发生，而且效果明显。 相似文献
5.
低温及L—精氨酸对肉用鸡腹水综合征的影响 总被引：1，自引：0，他引：1
用高能日粮饲养400只1日龄AA肉用鸡，14日龄时保优淘弱，随机分为3组，其中100只为常温（20℃）对照组；150只为低温（11℃）试验组；100只为低温（11℃）及日粮添加10g/kgL-精氨酸试验组，用单因子低温诱发肉用鸡腹水综合征，并不于同时间用红细胞压积、腹水心脏指数和腹水阳性率作为常规指标来判定肉用鸡腹水综合征，结果表明，低温组复制出肉鸡腹水综合征动模型，其发病率为9．33％，对照组为3．00％，与低温组比较差异极显著（P＜0．01）；L－精氨酸组腹水综合征发病率为3．00％。与低温组比较差异极显著（P＜0．01）。 相似文献
6.
15日龄雄性AA肉仔鸡240只,分为6组,一组于常规温度下饲养,为正常对照组;其余5组均在低温下饲养,一组为硝苯地平组,为药物对照组;一组不给任何药物,为阳性对照组;余下3组作为试验组,分别给予高、中、低剂量的参芪颗粒制剂,连用15 d。结果表明:低温饲养能明显提高肉鸡腹水发病率,中剂量及高剂量组腹水发病率明显低于阳性对照组。腹水心脏指数、肺动脉压指标显示,药物对照组、不同剂量参芪颗粒组均能不同程度地改善腹水心脏指数及肺动脉压,参芪颗粒对肉鸡腹水综合征有防治作用。 相似文献
7.
160只商品代AA肉仔鸡于29日龄时随机均分为常温对照组、热应激对照组、常温感染组和热应激感染组．研究了37℃热应激对实验性感染大肠杆菌肉鸡肺动脉压和右心功能的影响。结果37℃热应激1～3d极显著降低（P〈0．01）肉鸡感染大肠杆菌引起的肺动脉高压，肺动脉收缩压、舒张压和平均肺动脉压分别下降了34．78％、45．83％、40．48％。热应激3、7d，感染大肠杆菌肉鸡右心室收缩压显著下降（P〈0．05，P〈0．01），分别下降了26．60％、28．00％，右心室收缩和舒张压最大变化速率显著下降（P〈0．05），分别下降了77．50％，50．77％和75．00％、50．58％。结果表明，37℃热应激可以拮抗肉鸡感染大肠杆菌引起的肺动脉高压，降低感染肉鸡死亡率，但使右心功能下降。 相似文献
8.
静脉注射L-氨基胍对肉鸡肺动脉压及其相关指标的影响 总被引：1，自引：1，他引：1
按常规饲养条件饲养AA雄性肉鸡120羽，30日龄时随机分为试验组（T组）和对照组（C组）。T组肉鸡静脉注射L-AG（40mg／kg），C组肉鸡静脉注射生理盐水。分别在注射L-AG和生理盐水1、2、4h后测定平均肺动脉压（mPAP）、诱导型一氧化氮合酶（iNOS）活性、原生型一氧化氮舍酶（cNOS）活性、一氧化氮（NO）含量、红细胞压积（PCV）、电解质浓度、pH、超氧化物歧化酶（SOD）活性、过氧化氢酶（CAT）活性和丙二醛（MDA）含量。结果显示：（1）试验组mPAP、NO含量和iNOS活性均显著或极显著低于对照组（P〈0．05或P〈0．01）；（2）PCV和Ca^2＋在给药后2h和4h与对照组差异显著（P〈0．05）；（3）K^＋浓度在给药1h和2h后显著或极显著低于时照组（P〈0．05或P〈0．01）。结果表明，L-AG通过抑制iNOS活性，引起肉鸡肺动脉压的升高，从而推测iNOS具有调节肉鸡体内mPAP的作用并与肉鸡肺动脉高压综合征发生有着密切的联系。 相似文献
9.
血液粘度升高在肉鸡腹水综合征发生发展中的作用 总被引：17，自引：4，他引：13
以环境低温和高能量饲料诱发肉鸡腹水综合征，活体诊断腹水综合征患鸡，对腹水发生前后的红细胞压积（ＰＣＶ）和全血比粘度（ＢＲＶ）做动态测定。结果表明腹水综合征患鸡腹水形成前后ＰＣＶ和ＢＲＶ的四次测定值逐渐升高（Ｐ〈０．０５或Ｐ〈０．０１），而未发生腹水症的试验鸡其ＰＣＶ和ＢＲＶ的四次测定值无明显变化（Ｐ〉０．０５）。此试验说明血液粘度升高不仅在腹水综合征形成过程中起重要作用，而且在腹水综合征形成后的进 相似文献
10.
饮水高氯诱发肉鸡胫骨软骨发育不良的试验研究 总被引：6，自引：2，他引：4
２４０羽健康ＡＡ肉鸡随机均分为对照组，试验１组，试验２组。从８日龄志分别饮用含Ｃｌ０．０％、０．０９％、０．１８％的饮水以观察肉鸡胫骨软骨发育情况，同时对其进行了Ｘ射线、骨密度、血清学和形态学的研究。结果表明：（１）饮水高氯可增加胫骨软骨发育不良的发病率。（２）３周后病鸡胫骨近端的Ｘ射线可透区与软骨增生区的形态一致，其承重侧的骨皮质增厚。（３）试验组鸡的胫骨骨密度较对照组稍高，但差异不显著。骨密度 相似文献
11.
The effects of dietary flax oil and antioxidants on ascites and pulmonary hypertension in broilers using a low temperature model 总被引：4，自引：1，他引：3
1. Three experiments were conducted using a low temperature model to induce pulmonary hypertension (PH) and ascites in broiler chickens. Diets containing 25 g or 50 g flax oil/kg food and control diets with an equivalent amount of animal/vegetable (A/V) blend oil, with and without supplemental antioxidants (vitamin C and vitamin E) were used. The amount of PH was assessed by the ratio of right ventricle weight to total ventricle weight (RV/TV ratio). Birds were considered to suffer from pulmonary hypertension syndrome (PHS) if the RV/TV ratio was greater than 0.299. 2. In experiment 1, the test diets contained 50 g oil/kg food and were given during the grower period only. Birds fed on the flax oil diet tended to have a lower incidence of PHS, ascites and lower RV/TV ratios than birds fed on the control diet. However, when the flax oil diet was supplemented with antioxidants, the incidence of ascites, PHS, haematocrit and whole blood and plasma viscosity increased compared with birds fed on the flax oil diet without antioxidants. These effects were not seen in experiment 2, when the test diets containing 30 g oil/kg food (25 g flax oil plus 5 g A/V blend oil/kg food compared to 30 g A/V blend oil/kg food) were given during the grower period. However, in experiment 3, when the test diets containing 30 g oil/kg food were given from day 1 to week 8, birds fed on the control diet supplemented with antioxidants had a higher incidence of PHS than those fed on the control diet alone. 3. In all 3 experiments, there was no significant effect of dietary fat source or supplemental antioxidants on total food intake or food conversion. 4. We conclude that diets containing 50 g flax oil/kg food tend to reduce the incidence of PHS and ascites in broilers using a low temperature model but the results were not statistically significant. In some cases, supplementing diets with a combination of vitamin E and vitamin C increased the incidence of ascites and PHS. 相似文献
12.
1. Three hundred and eighty 1-day-old Arbor Acres broilers were divided into control (A) and experimental (B, C, D, and E) groups. 2. After 14 d of age the experimental groups were subjected to a cool temperature challenge by lowering the temperature 1 to 2°C per day down to 12°C, and maintaining this temperature until 7 weeks of age. 3. At the same time, l.5 mg/kg 3,3,5-triiodothyronine (T 3 ) was added to the diet of groups D and E, and 500mg/kg ascorbic acid (vitamin C) to the diet of groups C and E. 4. The incidence of pulmonary hypertension syndrome (PHS), body weight gain and feed intake were measured weekly. Lung and blood samples were collected weekly from 10 birds per group beginning on d 14, and the percentage of thick-walled peripheral lung vessels (%TWPV) and packed cell volume (PCV) were determined. 5. The lower ambient temperature and diets supplemented with T 3 increased PHS incidence and % TWPV and decreased body weight gain. 6. There was an increase in PCV after 5 weeks of age under lower ambient temperature 3 and the PCV values 14 were also significantly increased by T 3 . 7. Vitamin C supplementation reduced PHS incidence and % TWPV but did not change packed cell volume, body, weight gain, feed intake, or feed conversion. 8. It is concluded that vitamin C reduced PHS and the associated muscularisation of pulmonary arterioles induced by exposing broilers to cool environmental temperatures and feeding them with T 3 . 相似文献
13.
早期限饲对肉鸡肺动脉高压综合征发病率、生产性能和腹脂率的影响 总被引：1，自引：0，他引：1
采用低温诱发肉鸡肺动脉高压综合征,对比观察不同的早期限饲方法对于常温和低温条件下PHS的发病率、肉鸡生产性能和腹脂率的影响。在试验1中,限饲处理组肉鸡分别于7￣14日龄或7￣21日龄每天给料8h,对照组肉鸡全程自由采食。在试验2中,限饲组肉鸡分别于7￣14日龄给予对照组肉鸡前1d饲料消耗量的60%或80%。结果表明:早期限饲能够降低肉鸡PHS的发病率,在低温条件下尤其明显;早期限饲改善了饲料效率,同时未对肉鸡的胴体品质产生显著的影响,且适当限饲不影响肉鸡的最终上市体重。这表明早期限饲是一种有效的控制肉鸡PHS的方法,值得在实际生产中推广应用。 相似文献
14.
Echocardiography was used to study cardiovascular structure and function during the development of pulmonary hypertension syndrome (PHS) in broiler chickens. Body weight-normalized right and left ventricular diameters at both end-diastole (RVDD, LVDD) and end-systole (RVDS, LVDS) were determined weekly in broilers reared under either normobaric (altitude, 96.7 m) or hypobaric conditions (simulated altitude, 2900 m) until 5 wk of age. Hypobaric-exposed broilers had larger RVDD at 3 and 4 wk of age and larger RVDS at 3, 4, and 5 wk of age. Hypobaric-exposed broilers also had larger LVDD at 2, 3, 4, and 5 wk of age and larger LVDS at 4 wk of age. Right (RVFS) and left ventricular fractional shortening (LVFS) were smaller in hypobaric- vs. normobaric-exposed broilers at 3, 4, and 5 wk of age and at 4 wk of age, respectively. Among hypobaric-exposed birds, PHS-positive (+) broilers had larger RVDD and RVDS than PHS-negative (-) broilers on week 3 and on weeks 1 and 3 after hypobaric exposure, respectively. PHS-positive (+) broilers also had smaller RVFS on week 1 after hypobaric exposure. Electrocardiographic and post-mortem data indicated that PHS+ broilers also developed right ventricular hypertrophy when compared with PHS-negative (-) broilers. These results are consistent with the hypothesis that PHS develops as a result of pulmonary hypertension and cardiac overload and suggest that PHS+ broilers have a greater and more persistent reaction to hypoxia than PHS- broilers. 相似文献
15.
试验旨在研究多因素法构建肉鸡腹水综合征（AS）实验模型及其对肺组织血管内皮舒缩活性因子的影响。将158羽健康罗斯肉鸡随机分为空白组、低温模型组和多因素模型组，于25、35、45日龄随机取样，观察临床症状、剖检变化及肺组织病理变化，测定体重、发病率、腹水心脏指数（AHI），检测肺组织一氧化氮（NO）、内皮素-1（ET-1）、一氧化氮合酶（NOS）变化，并以实时荧光定量PCR法检测肺组织内皮素A型受体（ETAR）及血管内皮生长因子（VEGF）mRNA表达量。结果显示，各日龄低温模型组和多因素模型组肉鸡AHI均极显著高于空白组（P<0.01），各日龄多因素模型组肉鸡AHI均显著高于低温模型组（P<0.05）；35、45日龄低温模型组和各日龄多因素模型组肉鸡体重显著或极显著低于空白组（P<0.05，P<0.01）；35、45日龄低温模型组和各日龄多因素模型组AS发病率均极显著高于空白组（P<0.01），25日龄多因素模型组AS发病率极显著高于低温模型组（P<0.01）；35日龄AS肉鸡肺组织结构损伤，内皮细胞脱落、平滑肌排列紊乱；与空白组相比，35、45日龄低温模型组和多因素模型组肺组织NO与ET-1含量、iNOS活性、ETAR及VEGF mRNA表达量均显著或极显著升高（P<0.05，P<0.01），肺组织NO/ET-1、cNOS与TNOS活性均显著或极显著降低（P<0.05，P<0.01）。表明低温、高钠、高能饲料多因素法能够成功构建AS实验模型，多因素造模法较低温造模法更能反映疾病因素的多样性；肺组织血管内皮舒缩活性因子表达紊乱参与了AS的发生发展。 相似文献
16.
本研究开展了3个饲养试验,旨在探讨苯甲酸和精油单独或联合使用对肉鸡生长性能、肠道微生物含量及肝脏抗氧化性能的影响。试验1和2均选择1日龄肉鸡450只,分为3组,每组5个重复,每个重复30只。对照组均饲喂相同的基础日粮,试验1处理组肉鸡分别饲喂基础日粮添加1.5和3 g/kg苯甲酸,试验2处理组肉鸡分别饲喂日粮添加2和4 mg/kg精油。试验3选择1日龄肉鸡300只,分为2组,每组5个重复,每个重复30只,对照组饲喂基础日粮,处理组饲喂基础日粮添加1.5 g/kg苯甲酸和4 mg/kg精油。3个试验均开展42 d。结果：试验1,1.5 g/kg苯甲酸组较对照组和3 g/kg苯甲酸组显著提了21和42 d肉鸡的体重及1～21 d、22～42 d、1～42 d日增重（P＜0.05）,同时1.5 g/kg苯甲酸组各阶段肉鸡料重比最低（P＜0.05）。与对照组相比,苯甲酸处理组显著提高了盲肠乳酸菌含量（P＜0.05）,显著降低了盲肠大肠杆菌数量（P＜0.05）。试验2,基础日粮添加4 mg/kg植物精油组42 d肉鸡体重和日增重、盲肠乳酸菌含量（P＜0.05）,料重比和盲肠大肠杆菌数量最低（P＜0.05）。同时,植物精油组较对照组显著提高了肝脏谷胱甘肽过氧化物酶（GSH-Px）和谷胱甘肽-S转移酶（GST）活性（P＜0.05）,显著降低了肝脏丙二醛含量（P＜0.05）。试验3,处理组较对照组显著降低了嗉囊大肠杆菌数量（P＜0.05）。处理组肝脏谷胱甘肽过氧化物酶（GSH-Px）和和谷胱甘肽-S转移酶（GST）活性显著高于对照组（P＜0.05）,但丙二醛含量显著降低（P＜0.05）。结论：日粮添加1.5 g/kg苯甲酸或4 mg/kg精油可以改善肉鸡生长性能,降低肠道有害微生物含量,而苯甲酸与精油无论是单独添加还是联合使用均可以提高肉鸡肝脏的抗氧化状态。
[关键词]苯甲酸|精油|肉鸡|生长性能|抗氧化|微生物 相似文献
17.
Phonocardiography was evaluated as a noninvasive technique for diagnosis of cardiovascular adaptation and disease in broiler chickens. Heart sounds (HSs) were compared in a fast-growing (FG) commercial broiler line that is highly susceptible to chronic right heart failure resulting from pulmonary hypertension syndrome (PHS) and in a non-selected slow-growing (SG) broiler line that is resistant to PHS. HSs were analyzed in broilers reared in hypobaric hypoxia (HYP) and normobaric (CON) conditions. PHS was induced by a combination of embryonic hypoxia and HYP exposure. HSs were recorded with a microphone placed at the thoracic inlet of each chicken. Electrocardiograms were used to mark the sampling interval for the first, second, and total HS. Digitized HS signals were analyzed for peak frequency, mean peak frequency, and band width. Birds were examined for PHS lesions when 6 wk of age, at the end of each experiment. HSs were compared by line and treatment (Experiment 1) or by treatment and week (Experiment 2). In addition, HS frequencies were analyzed within the HYP treatment group for differences between birds with severe or no gross PHS lesions. HS frequencies generally decreased with age and were also lower in the FG than the SG line. Hypobaric exposure decreased all HS frequencies in the SG line and components of the first HSs in the FG line. The SG line did not develop gross lesions of PHS. In the FG line, significant differences in HS frequencies were observed between HYP and CON groups but not between PHS- and PHS+ broilers. Frequency changes described in humans with PHS were not observed. Further development to maximize the resolution of the HS waveforms and improved matching of the sampling interval to the electrical or hemodynamic output of the chicken heart may allow its use as a diagnostic tool for differentiating broilers with normal cardiac function or physiologic adaptation from those with cardiovascular disease. 相似文献
18.
《The Journal of Applied Poultry Research》2014,23(3):494-500
The cost of energy-contributing ingredients has increased over the last several years. Defining minimum dietary energy specifications for broilers is a strategy to mitigate high diet cost. Two experiments were conducted to evaluate the effects of diets with graded concentrations of AMEn fed to Hubbard × Cobb 500 (experiment 1) and Ross × Ross 708 (experiment 2) male broiler chicks from 14 to 28 d of age. Both experiments were identical in experimental procedures with the exception of genetic strain. Broilers were fed a common corn-soybean meal-based starter diet from 1 to 13 d of age. At 14 d of age, dietary treatments were provided with 1 of 6 concentrations of AMEn (3,000, 3,030, 3,060, 3,090, 3,120, and 3,150 kcal/kg). In experiment 1, BW gain, feed intake, and FCR of Hubbard × Cobb 500 broilers decreased linearly with increasing AMEn. Linear broken-line response of FCR was estimated at 3,062 kcal of AMEn/kg based on broken-line methodology. In experiment 2, Ross × Ross 708 broilers did not respond to graded concentrations of energy, as indicated by linear and quadratic regression of BW gain, feed intake, caloric conversion, and FCR data. Therefore, Hubbard × Cobb 500 male broilers respond to AMEn from 14 to 28 d of age and may be fed diets formulated at 3,062 kcal of AMEn/kg without loss of performance. Conversely, growth performance of Ross × Ross 708 male broilers was not affected by varying AMEn (3,000 to 3,150 kcal/kg) from 14 to 28 d of age. In addition, the response to AMEn may not be as pronounced with the modern broiler compared with broilers used in previous research. 相似文献
19.
试验旨在研究天蚕素抗菌肽对817肉杂鸡生长性能和免疫功能的影响。选取1日龄817肉杂鸡900羽,随机分为5个处理组（对照组、抗生素组及Ⅰ、Ⅱ、Ⅲ组）,每组6个重复,每个重复30羽。对照组饲喂基础日粮,抗生素组在基础日粮中添加150 mg/kg金霉素,Ⅰ、Ⅱ、Ⅲ组分别在基础日粮中添加100、200和300 mg/kg天蚕素抗菌肽,试验期42 d。结果显示,Ⅱ、Ⅲ组能显著提高1~21日龄817肉杂鸡的平均日增重（P<0.05）,显著降低料重比（P<0.05）;显著提高21、42日龄817肉杂鸡的胸腺、法氏囊和脾脏指数（P<0.05）;显著提高42日龄肉杂鸡的ND抗体水平和T淋巴细胞转化率（P<0.05）,表明在日粮中添加天蚕素抗菌肽能提高817肉杂鸡的生长性能和免疫功能,在本试验条件下,适宜的添加量为200 mg/kg。 相似文献
20.
This experiment was conducted to investigate the effects of antimicrobial peptide on growth performance and immune function of 817 broiler hybrids. Nine hundred one-day-old 817 broiler hybrids were chosen and randomly divided into 5 groups with 6 replicates per group and 30 broilers per replicate.The broilers in control group were fed with basal diet, broilers in the antibiotic group were fed with basal diet supplemented 150 mg/kg aureomycin,and that in groups Ⅰ,Ⅱ and Ⅲ were fed with basal diet supplemented 100,200 and 300 mg/kg antimicrobial peptide,respectively. The experiment period was 42 days. The results showed that average daily gain of 817 broiler hybrids in groups Ⅱ and Ⅲ was significantly increased (P<0.05),meanwhile the F/G was significantly decreased at 1-21 days old (P<0.05).The immune organ indexes of thymus,bursa of Fabricius and spleen were significantly increased at 21 and 42 days old (P<0.05),and the antibody level against ND and T lymphocyte transformation rate of 42 days old 817 broiler hybrids were improved (P<0.05). It indicated that antimicrobial peptide could increased growth performance and immune function of 817 broiler hybrids as same with aureomycin,and appropriate dosage of antimicrobial peptide was 200 mg/kg in this experiment. 相似文献